Blind Detection and Estimation of OFDM Signals in Cognitive Radio Contexts

摘要：

Cognitive radio bas been seen as a promising technique to address the frequency resource scarcity problem. It is a key issue to reliably detect the activity of primary users (PUs) for cognitive radio users. As orthogonal frequency division multiplexing (OFDM) has becoming a popular technique for modern wireless communications systems. It is necessary to identify the existence and estimate the key parameters OFDM systems in cognitive radio contexts In this paper, we propose a scheme to identify the Pus signals with OFDM. This scheme involves tbree steps. Firstjy, we propose a method to identify the activity of signals through spectrum sensing. Then, we provide a scheme to distinguish whether an active signaJ is OFDM signal or single-carrier signal. At last, the key parameters of OFDM such as the number of subcarriers and the cyclic prefix length are estimated blindly. Sim ulation results validate the proposed method.

关键词： cognitive radio OFDM blind detection and estimation

作者: Weiguang Liu Jun Wang Shaoqian Li

作者单位: National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu, Sichan, 61173I,China

会议类型: 国际会议

会议名称: 2010 2nd International Conference on Signal Processing System(2010年信号处理系统国际会议 ICSPS 2010)

会议地点: 大连

会议语种:英文

页码: 1187-1191

在线出版日期: 2010-07-05（万方平台首次上网日期，不代表论文的发表时间）